[Samsung Galaxy Nexus] rahimali:
For anyone that mistakenly booted up the ROM prior to flashing Gapps and then experienced FCs after flashing Gapps, there is a possible solution that does not involve reflashing the ROM and Gapps. That solution is noted here and I have reproduced it below for the sake of convenience and also attached the associated script file to this post.

Workaround for advanced users

!Warning no official support provided for this method!You can also try to manually workaround using several adb commands and a script:

Put the following contents in a file named fix_open_gapps_permissions.sh

#!/system/bin/env bash

# taken from https://bit.ly/2cAGvhE

# converted to bash script by @jomo

PHONE_PERMISSIONS="READ_PHONE_STATE CALL_PHONE READ_CALL_LOG WRITE_CALL_LOG ADD_VOICEMAIL USE_SIP PROCESS_OUTGOING_CALLS"

CONTACTS_PERMISSIONS="READ_CONTACTS WRITE_CONTACTS GET_ACCOUNTS"

LOCATION_PERMISSIONS="ACCESS_FINE_LOCATION ACCESS_COARSE_LOCATION"

CALENDAR_PERMISSIONS="READ_CALENDAR WRITE_CALENDAR"

SMS_PERMISSIONS="SEND_SMS RECEIVE_SMS READ_SMS RECEIVE_WAP_PUSH RECEIVE_MMS READ_CELL_BROADCASTS"

MICROPHONE_PERMISSIONS="RECORD_AUDIO"

CAMERA_PERMISSIONS="CAMERA"

SENSORS_PERMISSIONS="BODY_SENSORS"

STORAGE_PERMISSIONS="READ_EXTERNAL_STORAGE WRITE_EXTERNAL_STORAGE"

grantPerms() {

for perm in $2; do

echo ">" pm grant "$1" android.permission."$perm"

pm grant "$1" android.permission."$perm" 2>/dev/null

done

}

# Google Account

googleaccountPackage="com.google.android.gsf.login"

grantPerms "$googleaccountPackage" "$CONTACTS_PERMISSIONS"

grantPerms "$googleaccountPackage" "$PHONE_PERMISSIONS"

# Google App

googleappPackage="com.google.android.googlequicksearchbox"

grantPerms "$googleappPackage" "$CALENDAR_PERMISSIONS"

grantPerms "$googleappPackage" "$CAMERA_PERMISSIONS"

grantPerms "$googleappPackage" "$CONTACTS_PERMISSIONS"

grantPerms "$googleappPackage" "$LOCATION_PERMISSIONS"

grantPerms "$googleappPackage" "$MICROPHONE_PERMISSIONS"

grantPerms "$googleappPackage" "$PHONE_PERMISSIONS"

grantPerms "$googleappPackage" "$SMS_PERMISSIONS"

grantPerms "$googleappPackage" "$STORAGE_PERMISSIONS"

# Google Play Services

gmscorePackage="com.google.android.gms"

grantPerms "$gmscorePackage" "$SENSORS_PERMISSIONS"

grantPerms "$gmscorePackage" "$CALENDAR_PERMISSIONS"

grantPerms "$gmscorePackage" "$CAMERA_PERMISSIONS"

grantPerms "$gmscorePackage" "$CONTACTS_PERMISSIONS"

grantPerms "$gmscorePackage" "$LOCATION_PERMISSIONS"

grantPerms "$gmscorePackage" "$MICROPHONE_PERMISSIONS"

grantPerms "$gmscorePackage" "$PHONE_PERMISSIONS"

grantPerms "$gmscorePackage" "$SMS_PERMISSIONS"

grantPerms "$gmscorePackage" "$STORAGE_PERMISSIONS"

# Google Connectivity Services

gcsPackage="com.google.android.apps.gcs"

grantPerms "$gcsPackage" "$CONTACTS_PERMISSIONS"

grantPerms "$gcsPackage" "$LOCATION_PERMISSIONS"

# Google Contacts Sync

googlecontactssyncPackage="com.google.android.syncadapters.contacts"

grantPerms "$googlecontactssyncPackage" "$CONTACTS_PERMISSIONS"

# Google Backup Transport

googlebackuptransportPackage="com.google.android.backuptransport"

grantPerms "$googlebackuptransportPackage" "$CONTACTS_PERMISSIONS"

# Google Play Framework

gsfcorePackage="com.google.android.gsf"

grantPerms "$gsfcorePackage" "$CONTACTS_PERMISSIONS"

grantPerms "$gsfcorePackage" "$PHONE_PERMISSIONS"

# Google Setup Wizard

setupwizardPackage="com.google.android.setupwizard"

grantPerms "$setupwizardPackage" "$CONTACTS_PERMISSIONS"

grantPerms "$setupwizardPackage" "$PHONE_PERMISSIONS"

# Google Play Store

vendingPackage="com.android.vending"

grantPerms "$vendingPackage" "$CONTACTS_PERMISSIONS"

grantPerms "$vendingPackage" "$PHONE_PERMISSIONS"

grantPerms "$vendingPackage" "$LOCATION_PERMISSIONS"

grantPerms "$vendingPackage" "$SMS_PERMISSIONS"

The following commands will copy this script to your device and execute it, you should do this after Android has booted, you may delete the file afterwards.

adb push fix_open_gapps_permissions.sh /sdcard/

adb shell 'bash /sdcard/fix_open_gapps_permissions.sh'

adb shell 'rm /sdcard/fix_open_gapps_permissions.sh'

Script also attached below in the form of .txt file. Should be renamed to .sh prior to using